Add management fee callbacks

crates/fidc-core/src/broker.rs

@@ -933,6 +933,12 @@ where
                 ));
                 Ok(())
             }
+            OrderIntent::SetManagementFeeRate { rate, reason } => {
+                report.diagnostics.push(format!(
+                    "engine_account_intent_skipped kind=set_management_fee_rate rate={rate:.6} reason={reason}"
+                ));
+                Ok(())
+            }
         }
     }